﻿<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <script>
        var a = '{\"code\":200,\"msg\":\"44403\",\"obj\":\"3905\"}';
        alert(a.substring(a.indexOf('j\":\"') + 4, a.indexOf('\"}')));
    </script>
</body>
</html>